wooden deck under bifolds

[jonnyp1]

hi i am building raised hardwood deck under bifolds on 6 by 2 c 24 timber. The wife wants as level a threshold as possible, the outer edge of bifold is 10mm below inner already. Qustion is how close can i get to that outer height, do i need to allow for swelling/movement of timber? I was thinking of building deck to within 3-4 mm of bottom of door, is that enough?
cheers jon

 

[jj4091]

Sorry I can't help you but I will be interested in the answers you get to this question as it all ways puzzles me, when you see these home improvement programs, what they do about the DPC when Bi-folds run through level with the outside.